Yaws (A66)

ICD-10 code A66 and its subcodes are used to identify and classify various stages and manifestations of Yaws, a chronic infectious disease affecting the skin, bones, and joints.

These codes cover conditions from the initial skin lesions, such as the initial frambesial ulcer (A66.0), to multiple papillomata known as wet crab yaws (A66.1). The classification also includes early skin changes like maculopapular eruptions (A66.2), thickened skin or hyperkeratosis characteristic of yaws (A66.3), and more severe symptoms such as gummata and ulcers (A66.4), gangosa (chronic nasopharyngitis, A66.5), and bone or joint involvement, including arthritis and periostitis (A66.6). Other manifestations like juxta-articular nodules and latent yaws are captured under A66.7 and A66.8 respectively, while unspecified cases fall under A66.9. This detailed coding system helps medical coders accurately document yaws conditions, including synonyms like "frambesial ulcer," "butter yaws," or "gummatous osteitis," ensuring clarity in diagnosis and treatment records.